Liquid Crystal Display Data Driver Pre-Charge Voltage Control
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Solution Overview
Problem
As liquid crystal display devices increase in size and fidelity, the data integrated circuit (IC) generates excessive heat due to increased power consumption, leading to reduced reliability and higher operating temperatures, which existing pre-charge and charge share methods fail to adequately address.
Innovation Solution
A liquid crystal display device employs a comparator and pre-charge controller to selectively apply pre-charge and charge share voltages based on data element values, using a third supply voltage when the polarity is negative, and pre-charging or charge sharing with voltages of lower absolute values to manage power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid crystal display devices increase in size and fidelity, then display quality is improved, but power consumption increases and heat generation increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the pre-charge voltage level based on the data value being displayed. When the data value is below a threshold, a first pre-charge voltage is applied; when above the threshold, a second pre-charge voltage is applied. This dynamic parameter adjustment optimizes power consumption while maintaining display quality across different content scenarios.
2Measurement precision
If liquid crystal display devices increase in size and fidelity, then display quality is improved, but operating temperature increases
Solution Approach 1:
The patent controls operating temperature through parameter changes in the pre-charge voltage. By selectively applying different pre-charge voltage levels based on data thresholds, the system reduces unnecessary power consumption and heat generation in the data driver circuit, thereby maintaining acceptable operating temperatures while preserving display quality.
3Speed
If pre-charge voltage is always applied to data lines, then charging characteristics are improved, but power consumption increases
Solution Approach 1:
The patent implements preliminary action by applying pre-charge voltage to data lines before data writing occurs. However, this action is selectively applied only when necessary (when data values are below the threshold), rather than continuously. This preliminary charging action improves subsequent writing speed while avoiding unnecessary power consumption when pre-charging is not required.
Solution Approach 2:
The patent applies partial action by providing pre-charge voltage only to data lines that require it, based on the data value threshold. Instead of applying pre-charge to all data lines unconditionally, the system selectively charges only those lines where the data value warrants it, thereby optimizing the balance between charging characteristics and power consumption.
4Power
If data driver circuit operates at high power, then driving capability is improved, but reliability decreases
Solution Approach 1:
The patent applies dynamics by making the pre-charge voltage level adaptive rather than fixed. The data driver circuit dynamically adjusts its operating characteristics based on the actual data values being driven. This dynamic operation allows the circuit to maintain adequate driving capability when needed while reducing power consumption and improving reliability during normal operation, avoiding continuous high-power operation.
Data Source
AI summary
A liquid crystal display device includes a comparator which judges a voltage of data; and a pre-charge controller which pre-charges a data line of a liquid crystal display panel with a pre-charge voltage if the voltage of the data is a first voltage, and pre-charges the data line with a charge share voltage, which has a lower absolute value than the pre-charge voltage, if the voltage of the data is a second voltage that is lower than the first voltage.